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b259f8b752
Normally mount/cmount use `-o ro` to get the kernel to mark the fs as
read only. However this is ignored by WinFsp, so in addition if
`--read-only` is in effect then return EROFS ("Read only File System")
from all methods which attempt to modify something.
134 lines
2.8 KiB
Go
134 lines
2.8 KiB
Go
package mountlib
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import (
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"fmt"
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"strings"
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"sync/atomic"
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"time"
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"github.com/ncw/rclone/fs"
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)
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// Node represents either a *Dir or a *File
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type Node interface {
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IsFile() bool
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Inode() uint64
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}
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var (
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_ Node = (*File)(nil)
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_ Node = (*Dir)(nil)
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)
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// Noder represents something which can return a node
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type Noder interface {
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fmt.Stringer
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Node() Node
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}
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var (
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_ Noder = (*File)(nil)
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_ Noder = (*Dir)(nil)
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_ Noder = (*ReadFileHandle)(nil)
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_ Noder = (*WriteFileHandle)(nil)
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)
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// FS represents the top level filing system
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type FS struct {
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f fs.Fs
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root *Dir
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noSeek bool // don't allow seeking if set
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noChecksum bool // don't check checksums if set
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readOnly bool // if set FS is read only
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}
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// NewFS creates a new filing system and root directory
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func NewFS(f fs.Fs) *FS {
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fsDir := &fs.Dir{
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Name: "",
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When: time.Now(),
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}
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fsys := &FS{
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f: f,
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}
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fsys.root = newDir(fsys, f, fsDir)
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return fsys
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}
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// NoSeek disables seeking of files
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func (fsys *FS) NoSeek() *FS {
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fsys.noSeek = true
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return fsys
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}
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// NoChecksum disables checksum checking
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func (fsys *FS) NoChecksum() *FS {
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fsys.noChecksum = true
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return fsys
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}
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// ReadOnly sets the fs into read only mode, returning EROFS for any
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// write operations.
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func (fsys *FS) ReadOnly() *FS {
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fsys.readOnly = true
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return fsys
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}
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// Root returns the root node
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func (fsys *FS) Root() (*Dir, error) {
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// fs.Debugf(fsys.f, "Root()")
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return fsys.root, nil
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}
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var inodeCount uint64
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// NewInode creates a new unique inode number
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func NewInode() (inode uint64) {
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return atomic.AddUint64(&inodeCount, 1)
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}
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// Lookup finds the Node by path starting from the root
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func (fsys *FS) Lookup(path string) (node Node, err error) {
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node = fsys.root
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for path != "" {
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i := strings.IndexRune(path, '/')
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var name string
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if i < 0 {
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name, path = path, ""
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} else {
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name, path = path[:i], path[i+1:]
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}
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if name == "" {
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continue
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}
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dir, ok := node.(*Dir)
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if !ok {
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// We need to look in a directory, but found a file
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return nil, ENOENT
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}
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node, err = dir.Lookup(name)
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if err != nil {
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return nil, err
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}
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}
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return
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}
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// Statfs is called to obtain file system metadata.
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// It should write that data to resp.
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func (fsys *FS) Statfs() error {
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/* FIXME
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const blockSize = 4096
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const fsBlocks = (1 << 50) / blockSize
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resp.Blocks = fsBlocks // Total data blocks in file system.
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resp.Bfree = fsBlocks // Free blocks in file system.
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resp.Bavail = fsBlocks // Free blocks in file system if you're not root.
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resp.Files = 1E9 // Total files in file system.
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resp.Ffree = 1E9 // Free files in file system.
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resp.Bsize = blockSize // Block size
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resp.Namelen = 255 // Maximum file name length?
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resp.Frsize = blockSize // Fragment size, smallest addressable data size in the file system.
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*/
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return nil
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}
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